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Re: [bug-libunistring] two ways to use submodules for gnulib


From: Paolo Bonzini
Subject: Re: [bug-libunistring] two ways to use submodules for gnulib
Date: Wed, 29 Apr 2009 16:43:11 +0200
User-agent: Thunderbird 2.0.0.21 (Macintosh/20090302)

Simon Josefsson wrote:

> Thanks for your writeup on how to use git submodules for gnulib.  
> Is there already some
> instructions about this in gnulib somewhere?

No, I don't think so, but there should be!  The only disadvantage is
that bootstrap will not perform a shallow clone of gnulib, but rather a
full clone.  Hopefully the next versions of git will improve the
performance of full clones.

On the other hand, the advantages of submodules are evident.  In
particular, recording the gnulib version used for released versions is
extremely important, because from a tag one should be able to recreate
the code in release tarball exactly.  However, tracking a known-good
gnulib version for each commit is usually better, which is why I don't
think the "releases branch" method I gave is applicable outside
libunistring (and I would prefer a normal submodule to be used for
libunistring too).

For libunistring, the second method is passable because I guessed Bruno
wouldn't like having to do a commit to libunistring every time he
commits something related to it in gnulib, and because incompatible
changes to libunistring modules should not happen at all or at least
should be very rare.  I would expect in principle that libunistring 0.9
would compile out-of-the-box with next year's gnulib -- creating a
different tarball though, of course.

Paolo




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